厚煤层底板巷大断面在软岩支护技术中的应用

摘要

This article discusses a new attempt to large cross section in the application of soft rock supporting technology in thick coal seam floor tunnel ---"a beam three cable" anchor boltmesh supporting technology, and supporting parameters. The method use 3.5m long "U" shaped beam which called "a beam three rope" to make roof support as a whole, by increasing support stability to solve the soft top coal ,crushing, roof prone lacrosse, pumping leak caused bolt, anchor support failure. Cut using Excavating Construction specific construction sequence: bolt beat former exploration---roadheader cutting the upper half---temporary support---hit the anchor rod eye,installation the anchor rod---paved steel mesh---tighten the nuts---beat the anchor eye, placement of the anchor---placement of the"U"shaped steel beams, tightening---roadheader cutting the bottom half---beat sides to anchor rod---paved the steel mesh---tighten the nuts---guniting. Practice has proved,thick coal seam floor tunnel section, "a three-beam cable" anchor boltmesh supporting technology is an advanced technology which is economical, safe and reliable way of supporting.%本文论述了厚煤层底板巷大断面软岩支护技术的新尝试---“一梁三索”锚网索喷支护技术，以及支护参数。本法使用3.5m长“U”型梁“一梁三索”，使顶板支护成为一个整体，通过增加支护稳定性，解决了顶煤松软、破碎，抽漏造成锚杆、锚索支护失效的问题。切眼施工时采用炮掘施工，具体施工顺序：打前探锚杆-掘进机切割上半部---临时支护---打锚杆眼，安装锚杆---铺钢筋网---拧紧螺母---打锚索眼，上锚索---上“U”型钢梁，紧固---掘进机切割下半部---打两帮锚杆---铺钢筋网---拧紧螺母---喷浆。实践证明，厚煤层底板巷大断面“一梁三索”锚网索喷支护技术是一种技术先进，经济合理，安全可靠的支护方式。